diff --git a/lib/rssaction.php b/lib/rssaction.php
index cd4c8b51c4..3b303f73ea 100644
--- a/lib/rssaction.php
+++ b/lib/rssaction.php
@@ -270,14 +270,7 @@ class Rss10Action extends Action
             foreach($attachments as $attachment){
                 $enclosure=$attachment->getEnclosure();
                 if ($enclosure) {
-                    // DO NOT move xmlns declaration to root element. Making it
-                    // the default namespace here improves compatibility with
-                    // real-world feed readers.
-                    $attribs = array(
-                        'rdf:resource' => $enclosure->url,
-                        'url' => $enclosure->url,
-                        'xmlns' => 'http://purl.oclc.org/net/rss_2.0/enc#'
-                        );
+                    $attribs = array('rdf:resource' => $enclosure->url);
                     if ($enclosure->title) {
                         $attribs['dc:title'] = $enclosure->title;
                     }
@@ -285,12 +278,12 @@ class Rss10Action extends Action
                         $attribs['dc:date'] = common_date_w3dtf($enclosure->modified);
                     }
                     if ($enclosure->size) {
-                        $attribs['length'] = $enclosure->size;
+                        $attribs['enc:length'] = $enclosure->size;
                     }
                     if ($enclosure->mimetype) {
-                        $attribs['type'] = $enclosure->mimetype;
+                        $attribs['enc:type'] = $enclosure->mimetype;
                     }
-                    $this->element('enclosure', $attribs);
+                    $this->element('enc:enclosure', $attribs);
                 }
                 $this->element('sioc:links_to', array('rdf:resource'=>$attachment->url));
             }
@@ -358,6 +351,8 @@ class Rss10Action extends Action
                                               'http://commontag.org/ns#',
                                               'xmlns:foaf' =>
                                               'http://xmlns.com/foaf/0.1/',
+                                              'xmlns:enc' =>
+                                              'http://purl.oclc.org/net/rss_2.0/enc#',
                                               'xmlns:sioc' =>
                                               'http://rdfs.org/sioc/ns#',
                                               'xmlns:sioct' =>